2025 TEAS Science Entrance Exam
Question 1:
Which of the following correctly describes the law of segregation?
A) Genes separate independently of each other
B) Alleles separate during gamete formation
C) Traits are blended from parents
D) Dominant traits always mask recessive traits
Answer: B) Alleles separate during gamete formation
Rationale: The law of segregation states that allele pairs separate during gamete
formation so each gamete carries only one allele.
Question 2:
What is the function of a ribosome?
A) Store genetic information
B) Synthesize proteins
C) Produce energy
D) Transport materials
Answer: B) Synthesize proteins
Rationale: Ribosomes are the cellular structures responsible for protein synthesis.
Question 3:
Which of the following is the number of protons in an atom equal to?
A) Atomic number
B) Atomic mass
C) Number of neutrons
,D) Number of electrons
Answer: A) Atomic number
Rationale: The atomic number represents the number of protons in an atom’s
nucleus.
Question 4:
Which type of chemical bond holds complementary strands of DNA together?
A) Ionic bond
B) Covalent bond
C) Hydrogen bond
D) Metallic bond
Answer: C) Hydrogen bond
Rationale: Hydrogen bonds form between nitrogenous bases, stabilizing the DNA
double helix.
Question 5:
Which organelle is responsible for producing ATP, the energy currency of the cell?
A) Nucleus
B) Mitochondria
C) Golgi apparatus
D) Lysosome
Answer: B) Mitochondria
Rationale: Mitochondria generate ATP through cellular respiration.
,Question 6:
What is the primary function of the nephron in the kidney?
A) Produce hormones
B) Filter blood and form urine
C) Store urine
D) Regulate blood pressure
Answer: B) Filter blood and form urine
Rationale: Nephrons filter waste and excess substances from blood to produce
urine.
Question 7:
Which of the following hormones is primarily responsible for lowering blood
glucose levels?
A) Glucagon
B) Insulin
C) Cortisol
D) Adrenaline
Answer: B) Insulin
Rationale: Insulin facilitates cellular uptake of glucose, lowering blood sugar.
Question 8:
Which blood vessel carries oxygenated blood from the lungs to the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Vena cava
, Answer: B) Pulmonary vein
Rationale: Pulmonary veins return oxygen rich blood to the left atrium of the
heart.
Question 9:
Which of the following is an example of a catalyst in a chemical reaction?
A) Enzyme
B) Reactant
C) Product
D) Inhibitor
Answer: A) Enzyme
Rationale: Enzymes speed up chemical reactions without being consumed.
Question 10:
Which part of the brain regulates involuntary functions such as heartbeat and
breathing?
A) Cerebrum
B) Cerebellum
C) Brainstem
D) Hypothalamus
Answer: C) Brainstem
Rationale: The brainstem controls vital autonomic functions.
Question 11:
What is the process by which cells divide to produce two identical daughter cells?
Question 1:
Which of the following correctly describes the law of segregation?
A) Genes separate independently of each other
B) Alleles separate during gamete formation
C) Traits are blended from parents
D) Dominant traits always mask recessive traits
Answer: B) Alleles separate during gamete formation
Rationale: The law of segregation states that allele pairs separate during gamete
formation so each gamete carries only one allele.
Question 2:
What is the function of a ribosome?
A) Store genetic information
B) Synthesize proteins
C) Produce energy
D) Transport materials
Answer: B) Synthesize proteins
Rationale: Ribosomes are the cellular structures responsible for protein synthesis.
Question 3:
Which of the following is the number of protons in an atom equal to?
A) Atomic number
B) Atomic mass
C) Number of neutrons
,D) Number of electrons
Answer: A) Atomic number
Rationale: The atomic number represents the number of protons in an atom’s
nucleus.
Question 4:
Which type of chemical bond holds complementary strands of DNA together?
A) Ionic bond
B) Covalent bond
C) Hydrogen bond
D) Metallic bond
Answer: C) Hydrogen bond
Rationale: Hydrogen bonds form between nitrogenous bases, stabilizing the DNA
double helix.
Question 5:
Which organelle is responsible for producing ATP, the energy currency of the cell?
A) Nucleus
B) Mitochondria
C) Golgi apparatus
D) Lysosome
Answer: B) Mitochondria
Rationale: Mitochondria generate ATP through cellular respiration.
,Question 6:
What is the primary function of the nephron in the kidney?
A) Produce hormones
B) Filter blood and form urine
C) Store urine
D) Regulate blood pressure
Answer: B) Filter blood and form urine
Rationale: Nephrons filter waste and excess substances from blood to produce
urine.
Question 7:
Which of the following hormones is primarily responsible for lowering blood
glucose levels?
A) Glucagon
B) Insulin
C) Cortisol
D) Adrenaline
Answer: B) Insulin
Rationale: Insulin facilitates cellular uptake of glucose, lowering blood sugar.
Question 8:
Which blood vessel carries oxygenated blood from the lungs to the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Vena cava
, Answer: B) Pulmonary vein
Rationale: Pulmonary veins return oxygen rich blood to the left atrium of the
heart.
Question 9:
Which of the following is an example of a catalyst in a chemical reaction?
A) Enzyme
B) Reactant
C) Product
D) Inhibitor
Answer: A) Enzyme
Rationale: Enzymes speed up chemical reactions without being consumed.
Question 10:
Which part of the brain regulates involuntary functions such as heartbeat and
breathing?
A) Cerebrum
B) Cerebellum
C) Brainstem
D) Hypothalamus
Answer: C) Brainstem
Rationale: The brainstem controls vital autonomic functions.
Question 11:
What is the process by which cells divide to produce two identical daughter cells?
